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authorDavidlohr Bueso <davidlohr@hp.com>2014-06-04 16:06:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:53:57 -0700
commit4f115147ff802267d0aa41e361c5aa5bd933d896 (patch)
tree27afdf3f60c21fde601df63d9e9998b0c758a3fe /lib
parent6f04f48dc9c0433e2bb687f5f7f7af1aba97b04d (diff)
downloadlinux-4f115147ff802267d0aa41e361c5aa5bd933d896.tar.bz2
mm,vmacache: add debug data
Introduce a CONFIG_DEBUG_VM_VMACACHE option to enable counting the cache hit rate -- exported in /proc/vmstat. Any updates to the caching scheme needs this kind of data, thus it can save some work re-implementing the counting all the time. Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 99c8bfee1b00..c2de65045a40 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -501,6 +501,16 @@ config DEBUG_VM
If unsure, say N.
+config DEBUG_VM_VMACACHE
+ bool "Debug VMA caching"
+ depends on DEBUG_VM
+ help
+ Enable this to turn on VMA caching debug information. Doing so
+ can cause significant overhead, so only enable it in non-production
+ environments.
+
+ If unsure, say N.
+
config DEBUG_VM_RB
bool "Debug VM red-black trees"
depends on DEBUG_VM